T1/Phase 1: scaffold Vite SPA + Hono API + Bun worker

- apps/web: Vite + React 19 + TanStack Router/Query + shadcn/ui
   - apps/api: Hono + Bun on :3001 with /api/health, /api/auth/*, /mcp stubs
   - apps/worker: Bun worker stub, DB connection, graceful SIGTERM
   - apps/web-legacy/: old Next.js code moved aside (preserved for T2-T8 reference)
   - Dockerfiles: api (Bun), worker (Bun), spa (multi-stage Caddy)
   - Caddyfile: serves dist + reverse-proxies /api/* + /mcp to api
   - docker-compose.yml: 4-service target (api, spa, db, worker)
   - packages/db/src/client.ts: shared Drizzle client for api + worker
   - db/client.ts: root-level alias for convenience

   Parent: t_e1cbd87d -> t_24c9c3fd (T0)

apps/api/src/index.ts

@@ -0,0 +1,31 @@
+import { Hono } from "hono";
+import { cors } from "hono/cors";
+import { logger } from "hono/logger";
+import { authRoutes } from "./routes/auth";
+import { mcpRoutes } from "./routes/mcp";
+import { realtimeRoutes } from "./routes/realtime";
+
+const app = new Hono();
+
+// Middleware
+app.use("*", cors({ origin: "http://localhost:3000", credentials: true }));
+app.use("*", logger());
+
+// Health check
+app.get("/api/health", (c) => {
+  return c.json({ status: "ok", version: "0.1.0", runtime: "bun" });
+});
+
+// Routes
+app.route("/api/auth", authRoutes);
+app.route("/mcp", mcpRoutes);
+app.route("/api", realtimeRoutes);
+
+const port = parseInt(process.env.PORT || "3001", 10);
+
+export default {
+  port,
+  fetch: app.fetch,
+};
+
+console.log(`API server listening on :${port}`);